Watch Justice League vs. Teen Titans (2016) HD Full Movie Free on SolarMovie. Watch Justice League vs. Teen Titans (2016) online free. Robin is sent to work with the Teen Titans after his volatile behavior botches a Justice League miss...Robin is sent to work with the Teen Titans after his volatile behavior botches a Justice League mission. The Titans must then face Trigon after he possesses the League and threatens to conquer the world.